Merge pull request #2381 from suryanarayanakb/release-6.6.3.a1

Displaying the prefilter popup when the search text box is empty and mo...
"Code review changes handled for Ratings filters in search"
Merge remote-tracking branch 'upstream/release-6.6.3.a1' into release-6.6.3.a1
Merge pull request #2383 from sravanthi1/release-6.6.3.a1

"Code review changes updated for Ratings filters in search"
Changes for Mobile Friendly and OER tag selection
Merge pull request #2384 from ssushma/release-6.6.3.a1

Changes for Mobile Friendly and OER tag selection
Adding Publisher, Aggregator search values in search page.
Merge branch 'release-6.6.3.a1' of https://github.com/Gooru/Gooru-Web into release-6.6.3.a1

Conflicts:

src/main/java/org/ednovo/gooru/client/mvp/search/AbstractSearchView.java
lblCharLimitComments.setVisible(false).
Merge branch 'release-6.6.3.a1' of https://github.com/Gooru/Gooru-Web into release-6.6.3.a1
Merge pull request #2385 from mitraj/release-6.6.3.a1

Adding Publisher, Aggregator search values in search page.
Merge pull request #2386 from VinRudramurthy/release-6.6.3.a1

Player : comment text box made hidden at edit mode.
Merge remote-tracking branch 'upstream/release-6.6.3.a1' into release-6.6.3.a1
"handling the null"